Re: not all irqs detected

[Dominik Brodowski <devel-JhLEnvuH02M@public.gmane.org>]

On Sat, Aug 24, 2002 at 07:17:01PM +0200, joerg.beyer-htSm2yLGOjU@public.gmane.org wrote:
> My bios has not many things to adjust, but I can disable the
> psaux (mouse) and the bios says, if I disable psaux, then irq 12
> will be available. I attached a dmesg, with disabled psaux, and
> I would expect to see IRQ 12 used - but it isn't.
> 
> could anybody tell me, if it is correct to expect IRQ 12 used this
> way? 
It _may_ be available for other, i.e. PCI users then.
> 
> I tried to read & understand the driver/acpi/pci_*.c code, but I need
> some help to get started: how are the free/usable IRQs found
> and mapped?
The usable IRQs are set down in the DSDT table, the Detailed System
Description Table (which is more or less fixed in the BIOS). And as all PCI
IRQs are expected to be non-exclusive, all should be "free". However, the
ACPI code tries to use the available IRQs most effectively.

Dominik


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